[PATCH RESEND] mmc: core: Remove bounce buffer in mmc_send_cxd_data()

It is expected that Extended CSD register(the size of this register
is larger than CID/CSD) will be referenced more frequently as more
fields have been added to Extended CSD and it seems that it is not
a good option to double the memory used.

This patch is intended to avoid the use of bounce buffer for reading
Extended CSD register in mmc_send_cxd_data().

Signed-off-by: Kyungsik Lee <kyungsik.lee <at> lge.com>
---
 drivers/mmc/core/mmc_ops.c |   45 ++++++++++++++++++++++++++++---------------
 1 files changed, 29 insertions(+), 16 deletions(-)

diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
index 0ed2cc5..95d94a0 100644
--- a/drivers/mmc/core/mmc_ops.c
+++ b/drivers/mmc/core/mmc_ops.c
 <at>  <at>  -238,14 +238,6  <at>  <at>  mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
 	struct mmc_command cmd = {0};
 	struct mmc_data data = {0};
 	struct scatterlist sg;
-	void *data_buf;
-
-	/* dma onto stack is unsafe/nonportable, but callers to this
-	 * routine normally provide temporary on-stack buffers ...
-	 */
-	data_buf = kmalloc(len, GFP_KERNEL);
-	if (data_buf == NULL)
-		return -ENOMEM;